EP0786337B1 - Procédé pour l'écriture sur plaques d'impressions effaçables - Google Patents

Procédé pour l'écriture sur plaques d'impressions effaçables Download PDF

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Publication number
EP0786337B1
EP0786337B1 EP97100579A EP97100579A EP0786337B1 EP 0786337 B1 EP0786337 B1 EP 0786337B1 EP 97100579 A EP97100579 A EP 97100579A EP 97100579 A EP97100579 A EP 97100579A EP 0786337 B1 EP0786337 B1 EP 0786337B1
Authority
EP
European Patent Office
Prior art keywords
toner particles
printing forme
liquid toner
particles
printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97100579A
Other languages
German (de)
English (en)
Other versions
EP0786337A3 (fr
EP0786337A2 (fr
Inventor
Alfons Schuster
Michael Schönert
Alfred Dr. Hirt
Robert Weiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0786337A2 publication Critical patent/EP0786337A2/fr
Publication of EP0786337A3 publication Critical patent/EP0786337A3/fr
Application granted granted Critical
Publication of EP0786337B1 publication Critical patent/EP0786337B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/12—Developers with toner particles in liquid developer mixtures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1066—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by spraying with powders, by using a nozzle, e.g. an ink jet system, by fusing a previously coated powder, e.g. with a laser
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/34—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner
    • G03G15/342—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the powder image is formed directly on the recording material, e.g. by using a liquid toner by forming a uniform powder layer and then removing the non-image areas

Definitions

  • the invention relates to a method for imaging and deleting an erasable printing form according to claim 1
  • a method is known from EP 0 099 264 A2 for imaging a printing form with dry toner particles.
  • the entire surface of a substrate is covered with electrostatically charged dry toner particles, then these are melted by laser light in the image areas so that they adhere firmly to the substrate.
  • EP 0 580 394 A2 discloses a method for imaging a lithographic plate by applation. According to an image to be printed, portions of a plastic layer are removed by laser radiation.
  • a particular advantage of the printing form illustrated according to the invention is that it can be deleted. It is also advantageous that the printing form can be imaged within a printing press.
  • the printing form is preferably designed as a sleeve without a clamping channel on the forme cylinder. An electrical potential can be applied to the forme cylinder in order to then accentuate the printing form, as in electrophotographic processes.
  • a printing form 1 (FIG. 1) is imaged with charged particles 2.
  • the printing form 1 consists of either a conductive or a dielectric, electrically chargeable material. It is either a film, for example made of a plastic such as polyester or a metal, e.g. As aluminum, a ceramic or a glass. Suitable materials are known from CA-A-2154012. Alloys, for example nickel-chromium steels, nickel-chromium-iron alloys or nickel-chromium-molybdenum alloys, are also particularly suitable.
  • the surface of the printing form 1 is preferably hydrophilic or hydrophilizable.
  • the printing form 1 consists of an electrically conductive material, while the particles are being applied, a potential opposite to their charges or to their charge distributions which are effective in the direction of the surface of the printing form 1, is applied to the printing form 1 while the particles 2 are being applied. The particles 2 are attracted by the coulomb force. If the printing form 1 consists of an electrically non-conductive material on the surface, an electrically conductive layer must be present under this layer in order to charge the surface layer by means of a voltage source, for example by means of corona electrodes.
  • the particles 2 are preferably toner particles.
  • the toner particles 2 either have color pigments or they are unpigmented.
  • the particles 2 preferably have a diameter of less than 1 ⁇ m. Due to the electrostatic attraction between the surface of the printing form 1 and the particles 2, a uniform, very thin layer can be produced. Subsequently, image information is applied by means of high-energy electromagnetic radiation, in particular laser radiation, in accordance with an image to be printed by printing form 1.
  • a beam 3 (FIG. 2) is guided in the image area over the layer 4 formed by the particles 2 on the printing form 1. As a result, the particles 2 crosslink in the layer 4, as a result of which the adhesion to the surface of the printing form 1 is increased compared to the unirradiated areas on the printing form 1.
  • the particles 2 in the unirradiated area are then completely removed from the surface of the printing form 1 either by mechanical treatment, by electrical means or by means of ultrasound, for example by means of an ultrasound basin.
  • the resulting image can also be post-treated in order to further increase the strength of the layer 4 on the surface of the printing form 1.
  • the wavelength of the rays used for this purpose for example infrared or ultraviolet, depends on the absorption maximum of the material of the layer 4, ie the particle 2.
  • the printing form 1 contains at least in the superficial range a material that absorbs the infrared radiation, for example carbon, or if it has a black color.
  • pigmented toner particles for example toner particles, the soot or graphite contain, are particularly suitable for absorbing infrared radiation.
  • particles 2 which absorb ultraviolet radiation are also suitable if the absorption of this radiation favors electrical bonds of the particles 2 for crosslinking and further strengthening the image areas of the layer 4.
  • the strength and duration of action of the radiation and their wavelength thus depend on the material of the particles 2, on the material from which the printing form 1 is made, and on the material combination of the particles 2 and the printing form 1.
  • the surface of the printing form 1 can be subjected to a further treatment at the non-image areas, ie at the areas in which the layer 4 has not been removed, for example by hydrophilization, so that it accepts a dampening solution, provided that the printing process uses a dampening solution used, as is the case for example in wet offset printing.
  • the hydrophilization of the surface of the printing form 1 can also take place before the application of the particles 2 over the entire surface, if it is necessary. After the printing process has ended, the surface of printing form 1 must be restored.
  • the ink remaining on layer 4 and the free areas of printing form 1 must be removed, and then the particles 2 in layer 4 are removed.
  • a solvent e.g. B. acetone
  • Ultrasound treatment is also suitable for removing the image areas of layer 4.
  • the thickness of the layer 4 is preferably 1 ⁇ m or less. But it can also be much thinner, for example only 0.1 ⁇ m thick.
  • the particles 2 do not necessarily have to carry their own charge. Materials whose particles have dipole, qudrupole or other multipole moments which align in the electric field are also suitable, so that they are attracted to an electrically charged surface such as the surface of the printing form 1.
  • the particles 2 are in particular toner particles, wherein the toner can be a solid or a liquid toner. Both water-based toners and oil-based toners can be used.
  • the toner can be pigmented (transparent) or unpigmented.
  • the toner is unpigmented, if the particles 2 are to be crosslinked by heat radiation on the surface of the printing form 1, the surface of the printing form 1 itself must absorb the infrared radiation, whereby the particles 2 are indirectly heated so that their crosslinking is prevented the surface of the printing form 1 occurs. Likewise, the adherence of the particles 2 to the printing form 1 is also supported by this infrared radiation.
  • particles with different charge densities Q / m
  • Methods in which the particles 2 are broken down by negative pressure are also suitable for removing particles 2 not crosslinked by the jet 3 on the surface of the printing form 1.
  • the particles 2 can also be removed by electrophoresis, an electrical potential being applied to a body which is brought close to the printing form - the body is, for example, a roller - which is stronger than the potential of the printing form 1. This means that that if the printing form 1 is at a negative potential, the roller must have an even more negative potential in order to pull off the particles 2, which in this case are positively charged or have an electrical multipole which has a positive effect on the outside, from the printing form 1.
  • the differentiation of the ink acceptance behavior of the layer 4 applied according to FIG. 1 can also be achieved in that the layer 4 is removed (ablated) according to the print image to be generated by laser radiation or at least decomposed, so that it has a different acceptance behavior for one Ink or fountain solution.
  • the remaining toner particles 2 of the layer 4 are then crosslinked on the surface of the printing form 1 by heat treatment, in particular by electromagnetic radiation. This means that the step of removing (see FIG. 3) is omitted in this case.
  • the fixation of the particles 2 in the layer 4 on the printing form 1 described with reference to FIG. 2 is already sufficiently strong, it is not necessary after this treatment step and after removing unnecessary particles 2 the particles 2 remaining on the printing form 1 to fix once with a heat or radiation treatment. If, however, the irradiation by the laser beam 3 has only partially crosslinked the particles 2 in the image areas, these can be removed after the particles 2 have been removed in the non-image areas by treating the entire surface of the printing form 1 including the surface fix the remaining parts of the image of layer 4 on the printing plate 1 by means of heat, in particular with infrared radiation or by means of hot air, in such a way that they remain adherent for the duration of a print job.
  • the unirradiated and thus uncrosslinked particles 2 do not have to be removed from the surface of the printing form 1, since the cleaning already takes place in a cleaning step preceding the printing process or, if this is omitted, the first revolutions of the printing unit cause these particles 2 to be released to the printing material.
  • the high-energy radiation for fixing the particles 2 on the surface of the printing form 1 can also be achieved by incoherent light sources, for example a mercury vapor lamp.
  • incoherent light sources for example a mercury vapor lamp.
  • solvents for example n-methylpyrolidone, acidic or alkaline aqueous solutions, mechanical cleaning agents acting on the printing form surface or the application of water or a solvent jet under high pressure, in particular at high temperature, are also suitable.
  • High-energy radiation is also suitable for removing non-crosslinked particles 2 from the surface of the printing form 1. In this case, however, the radiation may only be directed to those areas where the particles 2 have not previously (or simultaneously) been crosslinked by the beam 3.
  • the method used according to the invention has the advantage that the printing form can be produced within the printing press itself.
  • a sleeve-like printing form can also be used.
  • Such a sleeve-like printing form can be replaced by removing it from the side wall of a printing unit of the printing press, particularly if the surface of the printing form no longer has the desired surface roughness.
  • a printing film which, for example, can be wound onto the forme cylinder, as is known from DE 43 03 872 C2.
  • the fact that the layer 4 is only very thin means that only little material is used.
  • the thickness of the layer 4 can be easily controlled and reproduced in the electrostatic application by varying the voltage and / or time.
  • a small and flexibly constructed and easily exchangeable imaging unit can be used. Toner particles or other particles 2 with different chemical and physical properties can be used. Conventional printing forms based on an aluminum layer or another metal can also be used to illustrate them according to the invention. The imaging process can also be carried out outside the printing press.
  • a method for imaging a printing form 1 is created, in which the printing form 1 is loaded over the entire area and coated over the entire area with particles 2, in particular toner particles 2, which are charged in opposite directions. Subsequently, the layer 4 formed by the particles 2 is fixed imagewise by a beam 3, in particular by a laser beam, in particular by infrared radiation, on the surface of the printing form 1 or is ablated imagewise. The non-fixed portions of layer 4 are then removed or the non-ablated portions are fixed by heat treatment over the entire surface.

Claims (10)

  1. Procédé pour exposer et effacer une plaque d'impression effaçable (1) moyennant l'utilisation de particules de toner liquide (2) lors du procédé d'exposition, selon lequel on charge tout d'abord électriquement la plaque d'impression (1) sur toute la surface, selon lequel les particules de toner liquide (2) qui possèdent soit des charges individuelles, soit des charges opposées aux charges de la plaque d'impression (1) ou bien des moments bipolaires ou multipolaires orientés en sens opposé des charges de la plaque d'impression (1), sont attirées par la plaque d'impression (1) sur toute la surface, et selon lequel les particules de toner liquide (2) sont ensuite fixées conformément à une image à imprimer, au moyen d'une source d'énergie, et selon lequel on élimine les particules de toner liquide (2) non fixées ou on les décompose d'une manière qui modifie le comportement d'acceptation de l'encre, et selon lequel on efface la plaque d'impression (1) dans sa totalité à la fin du processus d'impression en éliminant les particules de toner liquide (2) fixées.
  2. Procédé selon la revendication 1, caractérisé en ce que pour l'exposition, les particules de toner liquide (2) sont fixées aux emplacements de l'image ou aux emplacements ne comportant pas d'image de la plaque d'impression (1) et ces particules de toner liquide (2) sont éliminées au niveau des emplacements ne portant pas d'image ou au niveau des emplacements de l'image.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on utilise une plaque d'impression (1) comportant une surface conductrice, formée notamment d'un métal, ou une surface, qui possède un diélectrique qui peut être chargé électriquement au moyen d'une charge électrique, notamment au moyen d'une charge par effet couronne.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'une couche (4) des particules de toner liquide (2), qui est déposée sur la surface de la plaque d'impression (1), est fixée au moyen d'un faisceau (3) d'ondes électromagnétiques, notamment un faisceau laser, notamment dans le domaine de l'infrarouge.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que soit les particules de toner liquide (2), soit la plaque d'impression (1) contiennent un matériau absorbant, notamment une matière plastique, servant à absorber le rayonnement riche en énergie.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que les particules de toner liquide (2) non fixées sur la surface de la plaque d'impression (1) sont éliminées par une force mécanique, par un solvant, qui est appliqué notamment sous pression, par aspiration ou bien par utilisation d'un champ électrique ou par ultrasons.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que les parties de la couche (4), qui subsistent sur la surface de la plaque d'impression (1), sont fixées de façon supplémentaire au moyen d'un traitement sur toute la surface avec un rayonnement riche en énergie, notamment avec un rayonnement thermique.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que pour l'impression offset par voie humide, on rend hydrophiles des parties de la plaque d'impression (1) non recouvertes par les particules de toner liquide.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que pour la réticulation des particules de toner liquide (2) sur la surface de la plaque d'impression (1) ou pour le détachement des particules de toner liquide (2) de la surface de la plaque d'impression (1), on utilise une source de lumière focalisée et cohérente, notamment une lampe à vapeur de mercure.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que pour l'effacement de la plaque d'impression (1), on diminue de cette dernière le reste de la couche (4) des particules (2) fixées sur la plaque d'impression, à l'aide d'un solvant, notamment un solvant organique, à l'aide d'une solution aqueuse acide ou alcaline, dans laquelle les particules (2) se dissolvent, notamment sous haute pression ou bien à l'aide d'une force mécanique, notamment au moyen d'une brosse ou d'un tissu de nettoyage ou bien sous l'action d'une haute température, à l'aide d'un rayonnement riche en énergie ou bien par ultrasons, à la fin du processus d'impression.
EP97100579A 1996-01-24 1997-01-16 Procédé pour l'écriture sur plaques d'impressions effaçables Expired - Lifetime EP0786337B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19602328A DE19602328A1 (de) 1996-01-24 1996-01-24 Verfahren zum Bebildern einer löschbaren Druckform
DE19602328 1996-01-24

Publications (3)

Publication Number Publication Date
EP0786337A2 EP0786337A2 (fr) 1997-07-30
EP0786337A3 EP0786337A3 (fr) 1998-02-11
EP0786337B1 true EP0786337B1 (fr) 2001-09-19

Family

ID=7783459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97100579A Expired - Lifetime EP0786337B1 (fr) 1996-01-24 1997-01-16 Procédé pour l'écriture sur plaques d'impressions effaçables

Country Status (5)

Country Link
US (1) US6796237B2 (fr)
EP (1) EP0786337B1 (fr)
JP (1) JP3190275B2 (fr)
CA (1) CA2195826C (fr)
DE (2) DE19602328A1 (fr)

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US6244181B1 (en) 1998-07-16 2001-06-12 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
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WO2001019613A1 (fr) * 1999-09-15 2001-03-22 Scitex Corporation Ltd. Systeme d'imprimerie sans plaque
DE19947225A1 (de) * 1999-10-01 2001-04-12 Koenig & Bauer Ag Verfahren zur Behandlung von Druckplatten in Druckmaschinen
DE69912792T2 (de) * 1999-11-03 2004-09-23 Agfa-Gevaert Negativ arbeitendes Verfahren zur Herstellung einer lithographischen Druckplatte ohne Ablation
US6399280B1 (en) 1999-11-03 2002-06-04 Agfa-Gevaert Method for making a lithographic printing plate by a negative working non-ablative process
US6487970B2 (en) * 2000-01-18 2002-12-03 Agfa-Gevaert Method of lithographic printing with a reusable substrate
DE10008213B4 (de) * 2000-02-23 2005-12-08 Man Roland Druckmaschinen Ag Einrichtung zur thermischen Energieeinkopplung
DE10037998A1 (de) * 2000-08-04 2002-02-14 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zum Löschen einer wiederbebilderbaren Druckform
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US7121209B2 (en) * 2004-01-16 2006-10-17 Nandakumar Vaidyanathan Digital semiconductor based printing system and method
JP2011112871A (ja) * 2009-11-26 2011-06-09 Canon Inc 印刷装置および印刷方法
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Also Published As

Publication number Publication date
US20030089260A1 (en) 2003-05-15
EP0786337A3 (fr) 1998-02-11
DE19602328A1 (de) 1997-07-31
US6796237B2 (en) 2004-09-28
EP0786337A2 (fr) 1997-07-30
DE59704626D1 (de) 2001-10-25
JP3190275B2 (ja) 2001-07-23
JPH09201931A (ja) 1997-08-05
CA2195826C (fr) 2001-09-04
CA2195826A1 (fr) 1997-07-25

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